反应详情

To a solution of the title product of Example C (1.44 g, 5 mmol) in chloroform (30 mL), phosphorus pentachloride (1.04, 5 mmol) was added. The contents were immersed in an oil-bath at 70° C. and the temperature raised to reflux. After 18h, the pinkish colored reaction solution was cooled to room temperature. The reaction was diluted with water (75 mL) and solid potassium carbonate (2.2 g) added. The contents were stirred for about 10 min until no more effervescence was observed. More water (100 mL) was added and the reaction solution extracted with methylene chloride. The organic layer was separated, dried (MgSO4) and filtered. After removal of solvent, 1 6 g of the title product was isolated as an off-white solid. The compound was used in Example 1 without any further purification. 1H NMR (CDCl3) 1,2-2.2 (m, 16H), 3.6-3.9 (m, 2H), 4.7 (s, 2H), 7.53 (d,J=8 Hz, 1H), 7.74 (dd,J=3,8 Hz, 1H), and 8.56 ppm (d,J=3 Hz, 1H).

1. customThe contents were immersed in an oil-bath at 70° C.
2. temperaturethe temperature raised
3. temperatureto reflux
4. additionadded
5. extractionthe reaction solution extracted with methylene chloride
6. customThe organic layer was separated
7. dry with materialdried (MgSO4)
8. filtrationfiltered
9. customAfter removal of solvent, 1 6 g of the title product
10. customwas isolated as an off-white solid
11. customThe compound was used in Example 1 without any further purification